Amplifiers may fall victim to pesky feedback if they cannot match up sounds.
"Amps" and "subs," also known as amplifiers and subwoofers, respectively, are audio equipment designed to enhance your listening experience. They are very similar, but serve slightly different purposes, with amps intended to make sounds louder, and subs dedicated to amplifying bass.
Amplifiers
The three main types of audio amplifiers magnify sounds in different ways. The voltage amplifier increases the voltage of the signal that is given to the amp. A "volt" is a measurement of electrical pressure. By contrast, a current amplifier increases the current (ampere), or flow of electrons, of the original signal. A power amp does both at once. After amplifying the original audio signal, the device must compare the softer and louder sounds and reconcile any differences. If it fails to match the new, loud sound to the old, soft sound, feedback will result.
Amplifying Devices
Amplifiers are built with three main devices: a vacuum tube, bipolar junction transistor and field effect transistor. The BJT diffuses electrons while the FET controls conductivity.
Subwoofers
Subwoofers are essentially amplifiers dedicated to bass, or very low frequency, sounds. Powered subwoofers have their own pre-amp and amplifiers. The pre-amp makes sure higher frequencies are filtered so they do not interfere with bass sounds. The regular amplifier is the power source for the woofer.
Tags: amplifier increases, three main